Merge "SkiaRE: Use RGB_888x for isOpaque" into sc-dev am: f824b53807 am: 4177fd4fb4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/14752457

Change-Id: I5dcbef867281698a0fbd792bf86e0f4fa32ec026